A sample of limestone and other soil materials was heated, and the limestone decomposed to give calcium oxide and carbon dioxide. CACO3 (s) → Ca0(s) + CO2 (g) A 3.043 g sample of limestone-containing material gave 1.25 g of CO2, in addition to CaO, after being heated at a high temperature. What was the mass percent of CaCO3 in the original sample?

Consider the chemical reaction that takes place between solid copper and oxygen gas. Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. Cu(s) + O2(g) → 3C2 2- Reset 1 3 4 6 7 8. 9. -> (s) (1) (g) (aq) H Cu NR • x H20 LO

4. When a 19.34 gram piece of lithium is placed in a sample of water, how many grams of hydrogen gas are? 2 Li ( + 2 H,O → 2 LİOH(aq) + H«e) (s) 2(g)

Determine the mass in grams of 3.00 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.) Determine the formula weight of Al₂(SO₄)₃. Provide an answer to two decimal places.   How many moles of Ag are in 43.6 grams of Ag₂O?   100.0 mL of a 0.500 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution?

Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit both sides of the equation to balance it, if you need to.) Note: you are writing the molecular, and not the net ionic equation. [] → Ba(C1O₂)₂(aq) + H₂O(1) 2 X G

Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit both sides of the equation to balance it, if you need to.) Note: you are writing the molecular, and not the net ionic equation. [[] → BaCl₂(aq) + H₂O(1) X S

Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit both sides of the equation to balance it, if you need to.) Note: you are writing the molecular, and not the net ionic equation. → CaC1,₂(aq) + H₂O(1) X Ś

Two solutions were made, the first one was made by dissolving 2.27 g of Co(NO3)2 in 100.0 mL of water. Then, to make the second solution, 5.00 mL of this solution was added to the 250 mL volumetric flask, which was filled to the mark with water. What was the molar concentration of the Co(NO3)2 in the two solutions?

A sample of limestone and other soil materials was heated, and the limestone decomposed to give calcium oxide and carbon dioxide. CACO3 (s) → Ca0(s) + CO2 (g) A 5.483 g sample of limestone-containing material gave 2.14 g of CO2, in addition to CaO, after being heated at a high temperature. What was the mass percent of CACO3 in the original sample? %

Write the balanced molecular chemical equation for the reaction in aqueous solution for sodium hydroxide and tin(IV) acetate. If no reaction occurs, simply write only NR. 1 2 3 4 O 口。 ロ Dロロ:ロ|0口。 (s) (g) (aq) H. NR Na Ti Ac Sn